import java.util.*;
public class Example3_9 {
	public static void main (String args[]) {
		Scanner reader=new Scanner(System.in);
		double sum=0;
		int m=0;
		while(reader.hasNextDouble()) {
			double x=reader.nextDouble();
			m=m+1;
			sum=sum+x;
		}
		System.out.printf("%d个数的和为%f\n",m,sum);
		System.out.printf("%d个数的平均值是%f\n",m,sum/m);
	}
}
